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Scanning electron micrograph of a section of root nodule of a garden pea, Pisum sativum. Two cell types are visible, about 40 microns in size. The... more
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Scanning electron micrograph of a section of root nodule of a garden pea, Pisum sativum. Two cell types are visible, about 40 microns in size. The pink cells contain a network of membranes filled with bacteroids of Rhizobium leguminosarum. The green cells with cross walls act as a sponge that extends to the outer surface of the nodule, allowing air from the surrounding soil to reach the cells containing the bacteroids. The bacteroids, using a haem protein - leghaemoglobin - fix the atmospheric nitrogen to produce ammonium salts. This is an example of mutualism, or symbiosis. The bacterium gains a sequestered environment and products of photosynthesis from the plant, and the plant uses the fixed nitrogen for its growth. Globally, nitrogen fixation by micro-organisms produces about three times more fertiliser" - 150-200m tonnes/yr - than the entire world chemical industry."
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